Well that ecm batt fuse is Def okay so must be something else. Double checked fuses behind the seat, all good. Checked the right side dash fuses and.... Success. Finally found the Lil bugger. So much frustration. Fuse 29. Batt Accy 15 amp. Car is a 2015 Holden Vf2 Ssv Ute incase there are differences. Hopefully that helps someone else too.